tetrode

noun 0.745

triode

noun 0.709

vacuum tube

noun 0.598

thermionic valve

noun 0.580

pentoxide

noun 0.563

electron tube

noun 0.563

phototube

noun 0.550

transistor

noun 0.533

octopole

noun 0.532

hot cathode

noun 0.522

hexapole

noun 0.522

photomultiplier tube

noun 0.517

junction transistor

noun 0.515

potentiometer

noun 0.508

push-pull amplifier

noun 0.504